Ultrasound synovitis and bone erosions in non-dactylitic versus dactylitic PsA: (A) including dactylitis affected digits and (B) excluding dactylitis affected digits
| (A) US synovitis and erosions | Non-dactylitic PsA (86/155 (55.5%) patients) | Dactylitic PsA (69/155 (44.5%) patients) | Difference |
| Total GS ≥2 (joints) | 551/3422 (16.1%) | 642/2721 (23.6%) | p<0.001 |
| Total PD ≥1 (joints) | 114/3422 (3.3%) | 198/2721 (7.3%) | p<0.001 |
| Total GS ≥2+PD >1 (joints) | 89/3422 (2.6%) | 171/2721 (6.3%) | p<0.001 |
| Total US erosions (joints) | 15/3206 (0.5%) | 33/2557 (1.3%) | p<0.001 |
| Total erosion score (patient level) | Mean 0.28 (SD 0.87), median 0 (0–0) | Mean 0.72 (SD 1.63), median 0 (0–1) | p=0.016 |
| Total US erosive patients | 11/86 (12.8%) | 20/69 (29.0%) | p=0.012 |
| (B) US synovitis and erosions | Non-dactylitic PsA (86/155 (55.5%)) (same as A) | Dactylitic PsA (69/155 (44.5%)) (dactylitis excluded) | Difference |
| Total GS ≥2 (joints) | 551/3422 (16.1%) | 507/2466 (20.6%) | p<0.001 |
| Total PD ≥1 (joints) | 114/3422 (3.3%) | 126/2466 (5.1%) | p<0.001 |
| Total GS ≥2+PD >1 (joints) | 89/3422 (2.6%) | 101/2466 (4.1%) | p=0.003 |
| Total US erosions (joints) | 15/3206 (0.5%) | 24/2315 (1.1%) | p=0.008 |
| Total erosion score (patient level) | Mean 0.28 (SD 0.87), median 0 (0–0) | Mean 0.58 (SD 1.52), median 0 (0–1) | p=0.048 |
| Total US erosive patients | 11/86 (12.8%) | 18/69 (26.1%) | p=0.035 |
GS, grey scale; PD, power Doppler; PsA, psoriatic arthritis.